One of the mysteries of the English language finally explained.
A coat or jacket, chiefly of Afghan origin, made of animal hide (generally sheepskin) retaining the fleece on the inside.
Early 19th century; earliest use found in Mountstuart Elphinstone (1779–1859), administrator in India. From Persian regional pōstīn, Persian pūstīn coat of fur or fleece from early modern Persian pōst skin, hide, pelt.
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